Long draft spinning cradle



Jan. 7, 1936. H L, THOMAS ETAL- 2,027,211

LONG DRAFT SPINNING CRADLE Filed March 21, 1935 INYLENEORS I Ma aATTORNEYS Patented Jan. 7, 1936 UNITED STATES PATENT OFFICE Truslow,Whitinsville, Mass, Whitin Machine Works, Whitinsville, Mass., a

assignors to corporation of Massachusetts Application March 21, 1935,Serial No. 12,136

13 Claims.

The invention relates to long draft spinning framesin which endlessaprons or belts are used for conducting theyarn fibers from one pair ofrolls close into the bite of the next succeeding -15: pair, and moreparticularly to the cradles by which such belts are supported andguided, the object being among other things to reduce. to a minimum thewear on the belt edges incident to their rubbing on the cradle sidewalls, as well as generally to produce a more convenient and more.acceptable form of cradle, as will presently appear.

To this end the invention consists broadly in constructingthecradles in'front and rear sections or halves which can be clasped about the bottomdraft roll to be thereby held in place in definite and proper relationto the other rolls, and

so as to: support the belts more positively than heretofore and guidethem with minimum frictionandwear.

Fig; 1 of the accompanying drawing is a vertical cross section through aconventional long draft roll head to which the form of this inventionwhich is at present preferred has been applied.

Fig. 2 is a side elevation of the cradle removed.

Fig. 3 is thesame opened.

Fig. 4 is aplan according to the arrow of Fig. 2.

Fig. 5 is a detail of the removable beltbearing bar.

Fig. 6 is a front elevation of Fig. 4 and Fig. '7 a section on lineVII-VII of Fig. 2. In Fig. l' the back rolls are marked 1-2, the frontor delivery rolls 3-4 andthe middle rolls to which the cradle is applied5fi. The lower rollswill be understood in each case to be formed oncontinuous shafts extending the length of the frameand the upper rollsto be held in the usual capbars not shown and to be individuallyremovable, all as customary in this art.

The new cradle as shown is formed of front and back sectionshinged-toea'ch other on a transverse axis by the riveted hinge studsmarked 1. The front section comprises two vertical side plates 8 rigidlyconnected to each other by a suitably riveted cross-bar member 9 to formby itself a rigid structure, such member being a round rod appropriatelyshouldered and firmly riveted 50 in place. This section carries thefront bearings for the belts and which, in the case in hand, comprise abearing bar It), for the lower belt I2, removably seated in thefront-edge notches I l of the side plates 8 and a pair of opposedinwardly 55 projecting studs or fingers M respectively riveted to theplates to support the top belt l3. The latter can be removed from thishearing by passingiit through the open space between the opposed ends ofthe studs as described in application Serial No. 704,873, filed January2, 1934, and s thereupon the lower belt can be separated from the cradleby withdrawing the bearing bar II) from its notches.

The rear section of the cradle is likewise formed of two vertical sideplatesmarked l5 and preferably these are rigidly united by a rivetedcross member and preferably by one, as shown, which is fiat in sectionand serves as a roving-deflecting shelf marked l6 and which is providedwith upbent arms I! at its ends to serve as roving guards. I5 Theseguards project sufiiciently from the side Walls H) to keep the rovingfrom running off the edges of the belts, while the shelf makes therollhead self-threading as will be understood. The outline of the beltis shown by the dotted line in Fig. 4. Both the shelf part l6 and theguide parts I! of this cross member are riveted to the'side plates I5making the back section a rigid structure like the front.

The proximate margins of the two cradle sections are cut or shaped tofit around the bottom roll 6 or its shaft and likewise to form an uppernotch suitable to receive the top roll. When the cradle is claspedaround the bottom roll the respective side plate sectionsoccupy commonvertical planes and meet edge to edge in fiush relation at least so faras concerns their interior faces. This results in producing surfaces forthe belt edges to rub on which are continuously fiat and substantiallyuninterrupted, devoid of any jogs or shoulders or gaps in the paths ofthe belts, which, as we have found, accelerate the rate of wear, evenwhen all exposed edges are rounded and smoothed to avoid it. The partinglines or meeting edges of the flush plate sections, on whichthey-separate when opened, are indicated in'Fig. 2 at l8 and I9, onebeing above the bottom rollandthetother below it, and both constitutemerely cracks or fine crevices in the continuous edge-guiding surface,without any apparent effect on the belts, even after long usage. Thebelts may thus be used until they wear out or break down from othercauses.

In order best to produce and maintain this important fiush relationshipof the plate sections a hinge connection is used to connect them andwhich is best constructed by forming ofisets 20 on the rear platesections, which offsets forwardly overlap the outer faces of the frontplate sections, being pivoted to the latter by the hinge rivets I, at alevel or location which is inside of the runs of the top belt so thatthe rivet heads are not touched thereby.

The placing of the top roll 5 in the top roll notch formed between theupper parts of the hinged plate sections, above the level of the hingeaxis, locks the sections from being thereafter opened, which means thatthe top roll must be removed before the cradle can be disengaged fromthe lower roll. The sections can however be locked together in otherways, for example, the hinge ofiset 20 can be formed with a projectingnose as shown at 2| extended forward into such relation with the notchII, on one or both sides, that when the bearing bar In is pushed intothe notch it rides under the nose 2!, thereby also looking the hinge.This latter method of locking is preferable because it looks the partstighter and keeps the crevices at the parting lines l8 and I9 tightlyshut and impossible to open under vibration or otherwise when the hingeshave become limber from use. By thus producing edge to edge contactbetween the front and rear plate sections and properly locking them, thefurther advantage is secured that the circular aperture for the bottomroll can be made to fit quite snugly thereon, thereby improving thestability of the cradle, which has no other support except the tworolls. This keeps the belts in a more constant relation to the deliveryrolls which is an important factor in good work.

The hinge offset 20 is desirably, though by no means necessarily, formedasaseparate part electrically welded to the stamped side plates, but inany case it is extended well to the rear of the parting line so as tocontribute the strength of extra thickness to the narrow neck part ofthe rear side plate which lies between the top and bottom rolls, and atthe same time afford a wider bearing by which the cradle rests and rubson the bottom roll.

We claim; p

1. A cradle for long draft spinning frames having its side wallsconstituted respectively of front and rear plate sections adapted toclasp about a draft roll, said sections on each side of the cradleoccupying a common plane and closing on each other in edge to edge flushrelation to form a smooth and a substantially continuous belt guidingsurface around said draft roll.

2. A cradle for long draft spinning frames having its side wallsconstituted respectively of front and rear plate sections having theirproximate edges shaped to clasp around the bottom draft roll and. form atop notch to receive the top roll, said sections occupying a commonplane and closing on each other in edge to edge flush relation above andbelow said bottom roll to form an uninterrupted belt guiding surfacearound said roll. 3. A cradle for long draft spinning frames comprisinga front part composed of rigidly united side plates provided with beltbearings and a rear part composed of side plates pivoted to the frontplates to swing respectively in the same planes and adapted to closeabout the draft roll in edge to edge relation to said front plates.

4. A cradle for long draft spinning frames comprising two parts hingedtogether to clasp about a bottom draft roll, each part comprisingopposite side plate sections rigidly connected by a cross-bar member.

5. A cradle for long draft spinning frames comprising front and rearcradle sections hinged together with their proximate portions shaped toclasp around the bottom draft roll and form between them a notch toreceive the top roll, said sections comprising opposite plate sectionsin common planes.

6. A cradle as described comprising front and rear parts hinged to eachother so as to clasp the bottom roll and means for locking the partstogether.

7. A cradle as described comprising hingedtogether parts adapted toclasp the bottom roll between them, one of them having a removable beltbearing bar in locking relation to the hinge.

8. A cradle as described comprising hingedtogether side plates shaped toclose together, edge to edge in the space between the top and bottomrolls.

9. A cradle as described comprising front and rear plate sectionstogether forming the cradle side walls, one of said sections having athickened neck part between the top and bottom rolls, said thickenedpart being pivoted to the other section to form a hinge betweensections.

10. A cradle as described comprising front and rear sections hinged toeach other on an axis located between the runs of the top belt andadapted to clasp about the bottom roll.

11. A cradle as described comprising a front part composed of rigidlyconnected side plate sections and a rear part hinged thereto andcomposed of side plate sections rigidly united by a cross member, saidcross member having a flat section serving as a'roving guide.

12. A cradle as described having a front side plate section and a rearside plate section together constituting one cradle side wall, one ofsaid sections having an offset overlapping and pivoted to the other andholding both sections in a cormnon plane.

13. A cradle as described comprising a front part comprising side platesections united by a cross-bar and carrying bearing means for the topand bottom belts, a rear part comprising side plate sections also unitedby a cross-bar member, an offset hinge connecting the front and rearsections and maintaining them respectively in common planes, said frontand rear sections meeting edge to edge above and below the bottom rolland means for holding them against separa-

